Read Kirby's post above about the new term "Partial full length resizing" With the APS Allen Mags and I suppose the AXs this is critical. It took me way to long to catch on to this technique.
Too little resize results in a ring at the base of the neck.
Too much resize results in wrinkled cases just below the shoulder.
W/my die that's not very much of a turn. More like a tweak.
Once you get it its there forever.
Then for starting new cases like necking 300s to 270 slip a gasket/thin washer of about a dime's thickness between the die locking ring and top of the press and you're ready to do the initial neck size for fire forming with out dinking with the die setting.
It took my way too long to catch on to this also.
270fan. Even though the Good Book says "thou shalt not......" I envy your situation. Two rifles at APS:o Ya ought not post such stuff. It causes grief.